Combination of carburetor and governor



March 3, 1936. F. H. STEELE COMBINATION OF CARBURETOR AND GOVERNOR FiledJuly 5. 1934 2 Sheets-#Sheet 1 March 3, 1936. H. STEELE 2,032,638

COMBINATION OF CARBURETOR AND GOVERNOR Filed July 5, 1934 2 Sheets-Sheet2 Patented Mar. 3, 1936 UNITED STATES PATENT OFFICE COMBINATION OFCARBURETOR AND GOVERNOR Floyd H. Steele, Detroit, Mich., assignor toHandy Governor Corporation, Detroit, Mich., a corporation of MichiganThe present invention relates to a combination of carburetor andgovernor for internal combustion motors and more particularly toanautomatc device associated with the governor to operate the power jetand/or accelerating pump of the carburetor of the motor.

Today most carburetors are provided with some form of power jet whichenriches the mixture as the speed or load increases. This jet is usuallycontrolled from the carburetor throttle spindle, the mixture beingenriched as the throttle is opened.

When a governor is installed on a motor and `the motor speed controlledby the governor valve,

1 the carburetor throttle is held in a wide Aopen position. Where thereis a power jet, this position corresponds to a maximum enrichment of theexplosive mixture supplied to the motor. When the governor valve needonly. be opened slightly to give the proper speed and carry the load,the mixture furnished by the carburetor is that corresponding to highspeed` as the carburetor valve is wide open. Under such conditions themileage per gallon decreases, and a loss of as much as twenty per centin mileage may result by equipping the motor with a governor.

One form of carburetor now on the market has an accelerating pump andpower jet actuated by a rocker arm operated by a link connection to acrank on the carburetor spindle.

The principal object of the present invention is to provide a governorwhich has means to take over the operation of said link when thegovernor is associated with the carburetor, whereby 35 the acceleratingpump and fuel jet are no longer operated from the valvespindle. .Thusthe loss in mileage which would result if the governor were associatedwith the carburetor, and no change made in the connections for operatingthe accelerating pump and power jet, is eliminated.

Other objects and features of novelty will be apparent from thedescription taken in connection with the drawings, in which:

Figure 1 is a diagrammatic sectional elevation of a carburetor 'andgovernor constructed in accordance with the present invention;

Figure 2 is a similar view showing a modified power jet;

Figure 3 is a plan view of one form of governor unit built in accordancewith the present invention; ,v Figure 4 is a front elevation of thesame; and Figure 5 is a side elevation. f Referring to the drawings, thecarburetorI C comprises a conduit member IIl having the usual throttlevalve Il carried by the valve spindle I2, venturi I3, and mixing tubeI4. The carburetor shown is a down-draft carburetor, and so the chokevalve I5 is located above the Venturi I3.

To one side of the conduit member is the usual oat chamber i6, the mainjet I'I being supplied with fuel from this chamber through the tube I8.Associated with'the float chamber is an accelerating pump, consisting ofthe bcylinder I9 in which a ball and socket joint 28 to one arm of atwoarmed lever 29, the other arm being connected by a similar ball andsocket joint 30 and link 3i, shown in dotted lines, to the end of acrank 32, shown in full lines, on the valve spindle I2. A

suitable ball and socket joint is provided to connect the end of thecrank 32 to the link 3 I Other parts of the carburetor need not be shownor described since they have nothing to do with the present invention. i

The carburetor consisting of the above described parts is well-known andis'on the market at the present time. In operation, fuel is suppliedthrough the main jet il in the usual way. When starting up the motor oraccelerating, an increased opening of the throttle valve will depressthe piston 2l) of the accelerating pump and thereby discharge anaccelerating charge through the jet or nozzle 25. .if the throttle ishe1d-sui ciently open, say for the upper power range or speed, thepiston 2li holds the power jet valve 22 open so that the mixturesupplied to the motor is enriched as long as the power jet valve 22 isheld open.

As previously stated, the present invention is concerned with thecombination of the above described carburetor and a governor. Thegovernor G comprises a governor conduit member 33 having a flange 3l atits upper end adapted to be bolted to the flange 35 on `the lower end.of the carburetor conduit member. The governor -valve 36, disposedWithin the gas passage tl of the conduit member, is adapted to controlthe supply of combustible mixture to the motor so as to maintain the,speed of the motor constant.

any suitable mechanism may be used for controlling the valve 36. Asshown, the valve 36 is an unbalanced butterfly valve, and the governorls preferably of the well-known Handy type, such as described inapplication Serial No. 369,489, led June 8, 1929, by Arthur A. Bull.-

If this governor were merely associated with the carburetor as thus fardescribed, without any modification of the means lfor controlling thepower jet, at speeds or loads requiring. the governor valve to be onlypartly open there would be a loss in eiiiciency of the fuel consumption.It is the object of the present invention to provide the governor with adevice which will eliminate this disadvantage when a governor isassociated with a carburetor of the form already described.

As shown, the governorvhas lassociated therewith a cylinder 38 in whichis slidably fitted a piston 39. The lower end of the cylinder 38 isconnected with gas passage 31 by means of ports 40 and 4I the' port 4Iopening into the passage on the low pressure side of the governor valve,that ls to say, on the down-stream side of the governor valve. 'Ihesubatmospheric pressure in the gas passage 31 tends to move the piston39 downwardly, which motion is opposed by the spring Y through thecylinder head 44 and at its upper end has a ball constituting one memberof a ball and socket joint. The piston rod 4,3 is of such length thatthe link 3| may be disconnected at its lower end from the crank 32 andsaid lower end connected to the ball 45.

Thus it will be seen that the control of the accelerating pump and thepower jet is taken over by the spring 42 and subatmosp'heric pressure inthe gas passage 31. .The position of the carburetor throttle I I nolongerhas any influence on these parts. In operation, when the motor isdead, the accelerating pump piston 20 is in its lowermost position,being iorcedthere by spring 42, the power jet is open, and the governorvalve is open. In starting the motor, the choke valve I5 is usuallyclosed whereby turning over the motor with the starter produces reducedpressure in the passage 31 which pulls down the governor piston 39,thereby raising pump piston 20 and permitting the power jet valve 22 tobe closed. However, if the choke valve is promptly opened, the pressurein passage 31 will rise so that the spring 42 can act to force piston 39upwardly and piston 20 of the accelerating pump downwardly, therebygiving an accelerating charge to the mixing tube. If the carburetorvalve is left open, the speed of the motor will increase until itreaches f the governed speed, whereupon the governor valve 36 will movein a vclosing direction, reducing the pressure in the passage 31 andthus causing the piston 2li to rise in the accelerating pump.

With the motor idling and the car at rest, the carburetor valve issubstantially closed, the governor valve is open, the governor piston 39is down due to the closed position of the carburetor valve, and theaccelerating pump piston 20 is in its upper position. yNow, if it isdesired to start the car in motion, the carburetor throttle valve isopened substantially, whereupon the governor valve 33 will remain openuntil the motor reaches the governed speed.

Immediately after opening ythe carburetor valve fo start the car, thegovernor piston 39 is forced upwardly by the spring since the pressurein the passage 31 increases. This motion of piston 39 forces the pumppiston 20 downwardly to supply 'aosao'ss an accelerating charge to thenozzle 'Furthermore, thev piston 20 will hold the power jet valve f 22open until the governed speed is reached, when the pistons takepositions dependent on the reduced pressure in the passage 31. If theengine is operating in the upper load range, the governor valve will beopened wide enough so that the spring 42 will overcome the suction onpiston 39,

and the pump piston 2li will be held downy and keep the power jet valveopen. If the engine is operating in a lower power range, the governorvalve more nearly closes, and the resulting reduced pressure in thepassage 31 will pull the governor piston 39 downwardly, resulting inraising the pump piston 20 and permitting the power jet valve 22'toclose. If the motor is operating at governed speed and it is desired toreduce the same, then the carburetor throttle is closed more than thegovernor throttle. This increases 'the `vacuum or reduction of pressurein the passage 31 and causes the pump piston to rise, permitting thepower jet valve 22 to close.

Where the motor is operating below the governed speed and it is desiredto accelerate up to governed speed, the governor valve will be open. Toaccelerate, the carburetor throttle is opened, thus increasing thepressure in the gas passage 31 and causing the accelerating pump pistonto' move downwardly, lsupplying an accelerated charge to nozzle 25 andopening the power jet valve 22, which will remain open as long as theload on the motor is suillcient to require a substantial opening of thegovernor valve.

In the form of the invention illustrated inrig- Y Vure 2, instead ofhaving the power jet operate only through the upper load range, means issupplied whereby, as load or speed conditions require it, the fuelsupplied through the power jet valve increases gradually with increasedspeed or increased load. To accomplish this result, as shown to thelower end of the accelerating pump piston 20 and cooperates with a valveopening 22b in the plug 22- This valve is guided and pressed upwardly bya spring 22d. It is thought to be apparent that as the accelerating pumppiston 20 is moved downwardly, the conical valve 22 will vmove with it,thereby increasing the annular opening between it and the plug 22.

As previously stated, the governor valve 36 may be controlled in anysuitable manner so as to maintain the motor at a constant xed speed.Whatever form of governor control is employed, the vacuum cylinder 38 isdirectly associated with the governor conduit member or block 33.Preferably the cylinder is cast integral with the block.

One form of preferred governor unit is illustrated in Figures 3, 4, and5. This governor is of the suction type; that is to say, the governorvalve is controlled by the suction, vacuum, flow of gases, or acombination of two or more of these items. As shown, the conduit memberor governor block 33 is provided with two gas passages 31, the governorand carburetor being adapted for an eight-cylinder motor. The governorvalves 36 disposedin these gas passages and mounted on spindle 36" areshown type,

Mechanism for balancing the closing forces as of the unbalanced actingon the unbalanced valves is housed -in the is shown and described inPatent No. 1,604,283, granted October 26, 1926.

The conduit member or governor block 33 has the vacuum cylinder 38 casttherein. 'I'he piston 39 of this vacuum' cylinder has its piston rod 43projecting upwardly and provided at its upper end with a ball 45, which,with the lower end of the link 3|,'forms a ball and socket connectionbetween the two. As previously stated, the length of the piston rod 43is such that the ball 45 may be easily connected to the lower end of thelink 3l, and the positions of the piston of the accelerator pump will bethe same when thus connected as when the lower end of the link isconnected to the crank 32. The port 4| connecting the lower end of thevacuum cylinder and one of the gas passages 31 is clearly shown inFigures 3 and 4.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. The combination with the carburetor for an internal combustion motorhaving a conduit member, a throttle valve therein having a crank, a mainjet, a power jet, a lever pivoted on the carburetor to control saidpower jet, and a link of proper length to connect said lever and crankbut disconnected from the latter; of a governor comprising a conduitmember in alignment with the carburetor conduit member, a governor valvein the governor conduit, means to actuate said governor valve tomaintain the motor at a substantially constant speed, a cylinderassociated with said governor conduit member in communication with thegovernor conduit on the downstream side of the governor valve, a pistonin said cylinder actuated in one direction by thevacuum on thedownstream side of the governor valve, a spring to move the piston inthe other direction, and a piston rod for the piston projecting from thecylinder, the lower end of said link being connected to the upper end ofsaid piston rod to operate the lever, substantially as described.

2. The combination with the carburetor for an internal combustion motorhaving a conduit member, a throttle valve therein having a crank, anaccelerating pump, a power jet controlled by the piston of the pump, alever pivoted on the carburetor to actuate said piston, and a link ofproper length to connect said lever and crank but disconnected from thelatter; of a governor comprising a conduit member in alignment with thecarburetor conduit, a governor valve in the governor conduit, means toactuate said governor valve to maintain the motor at a substantiallyconstant speed, a cylinder associated with said governor conduit memberin communication with said conduit on the downstream side of thegovernor valve, a piston in said cylinder actuated in one direction bythe vacuum on the downstream side of the governor valve, a spring tomove the piston in the other direction, and a piston rod for the pistonprojecting from the cylinder, the lower end of said link being connectedto the upper end of said piston rod to operate the lever substantiallyas described.

3. A governor for internal combustion motors comprising, in combination,a conduit member having a throttle valve therein, means to actuate saidvalve to maintain the motor at a substantially constant speed; acylinder associated with said `member in communication with said conduiton the downstream side of said valve, a piston in said cylinder actuatedin one direction by the vacuum on the downstream side of the valve, aspring to move the piston in the other direction, and a piston rod forthe piston projecting from the cylinder and of proper length to beconnected to a link of a carburetor designed to control the power jet ofthe carburetor substantially as described.

4. The combination with the carburetor for an internal combustion motorhaving a conduit member, a throttle valve therein having a spindle, afuel system discharging into said conduit, means to change the richnessof the mixture discharged by said fuel system including a memberactuated by said spindle when the carburetor without a governor is usedbut disconnectible atone end when a governor is used; of a governorcomprising a conduit member in alignment with the carburetor conduitmember, a governor valve in the governor conduit, means to actuate saidgovernorvalve to maintain the motor at a substantially constant speed, acylinder associated with said governor conduit member in communicationwith the governor conduit on the downstream side of the governor valve,a piston in said cylinder actuated in one direction by the vacuum on thedownstream side of the governor valve, a spring to move the piston inthe other direction, and a piston rod for the piston projecting from thecylinder, the upper end thereof being connected to the disconnected endof said member substantially as described.

5. The combination with the carburetor for an internal combustion motorhaving a conduit member, a throttle valve therein having a spindle, acrank on the spindle, a fuel system discharging into said conduit, meansto change the richness of the mixture discharged by said fuel systemincluding a link; of a governor comprising a conduit member in alignmentwith the carburetor conduit member, a governor valve in the governorconduit, means to actuate said governor valve to maintain the motor at asubstantially constant speed, acylinder associated with said governorconduit member in communication with the governor conduit on thedownstream side of the governor valve, a piston in said cylinderactuated in one direction by the vacuum on the downstream side of thegovernor valve, a

spring to move the piston in the other direction,

a piston rod for the piston projecting from the cylinder, and means toselectively .connect one end of said link to the crank or upper end ofsaid piston rod substantially as described.

6. As a unit of manufacture, a complete governor for internal combustionmotors, comprising, in combination, a conduit member having a throttlevalve therein, means to actuate said valve to maintain the motor atsubstantially constant speed, a cylinder cast in said member incommunication with said conduit on the' downstream side of said valve, apiston in said cylinder actuated in one direction by the vacuum on thedownstream side of the valve, a spring to move the piston in the otherdirection, and-a piston rod for the piston projecting from the cylinderand designed to be connected to a member of a carburetor which controlsthe power jet thereof, substantially as described.

FLOYD H. STEELE.

